49.00 $ CircO2 Quick-Dissolve Nitric Oxide Lozenges with Beet Root: A Coach's Honest Review Phoenix

If you've been searching for a way to support healthy blood flow before a workout, you've probably stumbled across the CircO2 Quick-Dissolve Nitric Oxide Lozenges with Beet Root. They sit in your mouth, dissolve in about 30 seconds, and deliver a beet-root-based nitrate load straight to your bloodstream. No swigging a glass of beet juice. No swallowing a handful of capsules. Just a lozenge.

I've coached people through every kind of pre-workout routine you can imagine, and sublingual (under-the-tongue) delivery has always interested me because it skips the digestive tract. That means faster absorption and a more predictable timing window before you hit the gym. The question is whether this particular product delivers on that promise without a long list of fillers or questionable dosing.

Below, I'll walk you through what's in the tin, how the science on dietary nitrates and nitric oxide actually stacks up, who will benefit most, and who should probably skip it. I'll also flag where I couldn't verify a spec so you can double-check before you buy.

Quick Answer
CircO2 Quick-Dissolve Nitric Oxide Lozenges with Beet Root are a sublingual nitrate supplement designed to support nitric oxide production and healthy circulation. They may help with pre-workout blood flow and endurance, based on research into dietary nitrates. Best for active adults who want a convenient, no-swallowing nitrate source. Not a blood-pressure medication. Check with your doctor before use if you take antihypertensives.

Visit the official website to learn more about its circulation-support formula and available offers.

Product Specs at a Glance

Coach's Tip: Before you buy, check the label for the exact milligrams of beetroot extract per lozenge. Most research on dietary nitrates uses doses of 400–600 mg of nitrate (roughly equivalent to 5–10 ml of beetroot juice), so you want to confirm the lozenge delivers a meaningful amount. If the label just says "beet root extract" without a mg figure, reach out to the manufacturer before purchasing.

Visit the official website to learn more about its circulation-support formula and available offers.

Design and Build: What You're Actually Getting

The lozenge format is the main selling point here. Instead of a capsule you swallow or a powder you mix into a shaker, you pop a small, flat disc under your tongue and let it dissolve. The whole process takes about 20–30 seconds, which means you can do it in the parking lot, at your desk, or in the gym locker room without a water bottle.

The tin (or pouch, depending on the package size) is compact—roughly the size of a matchbook tin . That makes it easy to toss in a gym bag or a front pocket. The lozenges themselves are firm enough to handle but dissolve quickly once they hit the moisture under your tongue.

One thing I appreciate about the sublingual route: you avoid the "beet burps" and the pink urine that come with drinking a full glass of beetroot juice. If you're heading into a meeting or a date after your workout, that's a small but real quality-of-life win.

The flavor is mild. Beetroot has an earthy taste that some people find off-putting in juice form, but the lozenge format softens that significantly. 

Visit the official website to learn more about its circulation-support formula and available offers.

Performance and Features: What the Science Says

How Dietary Nitrates Become Nitric Oxide

Here's the pathway in plain language. Beetroot is rich in inorganic nitrate (NO₃⁻). When you absorb nitrate—whether from juice, powder, or a lozenge—about 25% is concentrated in your salivary glands. Oral bacteria then reduce that nitrate to nitrite (NO₂⁻). When the nitrite reaches your stomach and bloodstream, it converts to nitric oxide (NO), the molecule that relaxes smooth muscle in your blood vessel walls. That relaxation is called vasodilation, and it widens your arteries so blood (and oxygen) flows more freely.

Research supports this pathway well. A landmark study by Bailey and colleagues found that beetroot juice improved time-trial cycling performance by enhancing nitric oxide availability, and the effect was blocked when subjects used an antiseptic mouthwash that killed the oral bacteria responsible for the nitrate-to-nitrite conversion (Bailey et al., Journal of Applied Physiology, 2009). That mouthwash detail matters because it confirms the sublingual/salivary route is a real mechanism, not just a marketing story.

A 2018 systematic review and meta-analysis in Sports Medicine (Schwab et al.) pooled data from multiple trials and concluded that dietary nitrate supplementation can produce small but statistically significant improvements in endurance performance, particularly in moderate- to high-intensity cycling and running. The effect size was modest—think a 1–3% improvement in time to exhaustion or a slight reduction in oxygen cost at a given pace—not a dramatic performance jump.

For cardiovascular health more broadly, Lundberg and colleagues reviewed the role of nitric oxide in vascular biology and noted that the dietary nitrate-nitrite-NO pathway is an important alternative to the enzyme-based (nitric oxide synthase) route, especially in aging adults or those with endothelial dysfunction (Lundberg et al., Nature Reviews Cardiology, 2016).

What That Means for a Lozenge

The sublingual format delivers the nitrate directly to the salivary glands and the mucosal tissue under your tongue, which is exactly where the nitrate-to-nitrite conversion happens. In theory, this should be as effective as, or slightly faster than, swallowing beetroot juice, because you're placing the nitrate right at the site of the bacterial conversion.

Timing: Based on the pharmacokinetics of sublingual absorption, you'd expect the nitrate to hit your saliva within minutes and the downstream NO effect to build over 30–60 minutes. For a pre-workout use, I'd take the lozenge about 45–60 minutes before your first set or your warm-up run. 

What It Won't Do

I want to be straight with you: a nitric oxide lozenge is not a stimulant. It won't make you feel wired, jumpy, or "pumped" the way a caffeine-based pre-workout does. The effect is more subtle—slightly easier breathing during steady-state cardio, a small reduction in the rate of perceived exertion, maybe a touch better recovery between sets. If you're expecting a dramatic change in how you feel after 30 seconds, you'll be disappointed.

It is also not a blood-pressure medication. While research shows dietary nitrates may modestly lower systolic blood pressure (by roughly 2–4 mmHg in some trials), that is not the same as treating hypertension. If you have a diagnosed cardiovascular condition, talk to your doctor before adding any nitrate supplement to your routine.

Visit the official website to learn more about its circulation-support formula and available offers.

Pros and Cons

Pros

• Sublingual delivery is fast, convenient, and skips the stomach

• No need to drink a glass of earthy beetroot juice

• Compact and portable; easy to fit into a pre-workout routine

• Beet root is a well-studied, naturally occurring nitrate source

• May support modest improvements in endurance and oxygen delivery

• No stimulants, so it won't interfere with sleep if taken in the morning

• Quick-dissolve format is easy for people who have trouble swallowing capsules

Cons

• Effect size is small; not a performance "magic bullet"

• Exact mg of beetroot extract per lozenge needs label verification

• Requires oral bacteria to be active; heavy use of antiseptic mouthwash can blunt the effect

• Not a substitute for medical treatment of hypertension or cardiovascular disease

• Price per serving may be higher than a bottle of beetroot juice

• Limited independent third-party testing data available for this specific product

Common Mistake: Taking the lozenge and then immediately rinsing your mouth with an antiseptic mouthwash or alcohol-based mouth spray. The whole mechanism depends on the bacteria in your saliva converting nitrate to nitrite. If you kill those bacteria right after the lozenge dissolves, you undermine the process. Wait at least 30 minutes before using any mouthwash, or skip it on days you take the supplement.

Who It's For (and Who Should Skip It)

Good fit if you:

• Are an active adult (roughly 25–65) who does regular cardio, cycling, running, or resistance training and wants a small, evidence-based edge on blood flow and endurance

• Prefer a no-stimulant, non-caffeine pre-workout option

• Don't enjoy the taste of beetroot juice but still want the nitrate benefit

• Want a convenient, travel-friendly supplement that fits in a pocket

• Are curious about the nitric oxide pathway and want to try a sublingual delivery format

Skip it or talk to your doctor first if you:

• Take blood-pressure medication (especially nitrates like nitroglycerin, or PDE-5 inhibitors like sildenafil). Combining supplemental nitrates with these drugs can cause a dangerous drop in blood pressure.

• Have a diagnosed cardiovascular condition, are pregnant or breastfeeding, or are under 18

• Are on a strict sodium-restricted or nitrate-restricted medical diet

• Expect a large, immediate performance change. The evidence points to small, gradual benefits, not a dramatic shift.

Alternatives to Consider

If the lozenge format isn't for you, here are a few other ways to get a dietary nitrate load:

You can also combine approaches. Some athletes take a beetroot juice 2–3 hours before a long event and a citrulline capsule 30 minutes before a resistance session. The pathways are different, so they're not redundant.

If you're already exploring other non-stimulant supplements for your training routine, it helps to knowwhat to look for in a metabolism-support supplement so you can evaluate the full label, not just the headline ingredient. And if you're building a broader supplement stack,how to evaluate ingredients in weight-management supplements gives you a practical framework for reading labels critically.

How to Use CircO2 Lozenges: A Simple Pre-Workout Protocol

Here's a straightforward way to slot the lozenge into your training day:

1. T-minus 60 minutes: Take one CircO2 lozenge. Place it under your tongue and let it dissolve naturally. Don't chew or swallow it whole. Avoid eating or drinking for 10 minutes afterward.

2. T-minus 30 minutes: Begin your warm-up. For a run, that's 5–10 minutes (8–16 km) of easy jogging. For lifting, it's 5 minutes on a rowing machine or bike, followed by 1–2 light sets of the first compound movement.

3. T-minus 0: Start your main workout.

4. Post-workout: Rehydrate with water and electrolytes. You can eat normally. No need to avoid food.

5. Daily use (optional): If you want a general circulation-support habit, one lozenge in the morning is fine. 

For a sample week, you might take the lozenge on your three hardest training days (e.g., a tempo run, a heavy lower-body lift, and a cycling interval session) and skip it on rest or easy days. You don't need it every single day to see the modest benefits the research describes.

Visit the official website to learn more about its circulation-support formula and available offers.

FAQ

Do nitric oxide lozenges actually work?
Research on dietary nitrates (the compound in beetroot) supports small improvements in endurance and blood flow. The sublingual lozenge format delivers nitrate to the same salivary pathway studied in beetroot-juice trials, so the mechanism is plausible. The effect is modest, not dramatic.

How long does it take for CircO2 lozenges to kick in?
Sublingual absorption is faster than swallowing a capsule. You can expect the nitrate to reach your saliva within minutes, with the downstream vasodilation effect building over roughly 30–60 minutes. Take the lozenge about an hour before your workout for the best timing window.

Are nitric oxide lozenges safe to take every day?
For healthy adults, daily use of a beetroot-based nitrate supplement is generally considered low-risk. However, if you take blood-pressure medication, nitrates, or PDE-5 inhibitors, check with your doctor first. Also, avoid heavy use of antiseptic mouthwash, which can interfere with the nitrate-to-nitrite conversion.

Can I take CircO2 with a caffeine pre-workout?
There's no known harmful interaction between dietary nitrates and caffeine. Many athletes combine the two. If you're new to either, start with one at a time so you can tell which one is affecting your blood pressure or heart rate.

What's the difference between nitric oxide lozenges and drinking beetroot juice?
The active ingredient (dietary nitrate) is the same. The difference is delivery. A lozenge dissolves under the tongue and hits the salivary glands directly, which may be slightly faster and more convenient. Beetroot juice requires swallowing and digestion but delivers a larger total nitrate dose per serving.

Will I get "beet burps" or pink urine from the lozenge?
Much less likely than with juice. The nitrate dose in a single lozenge is smaller than a full glass of beetroot juice, and the sublingual route means less passes through your stomach. You may notice a faint pink tint in urine on the first day, but it should be far less noticeable than with juice.

Visit the official website to learn more about its circulation-support formula and available offers.

Final Verdict

The CircO2 Quick-Dissolve Nitric Oxide Lozenges with Beet Root are a well-conceived, convenient way to get a dietary nitrate load without the hassle of beetroot juice. The science behind the nitrate-nitrite-nitric oxide pathway is solid, and the sublingual format makes logical sense for targeting the salivary conversion step. If you're an active adult looking for a small, evidence-based nudge in endurance and blood flow, this is a reasonable option to try.

That said, manage your expectations. The research points to single-digit percentage improvements in endurance metrics, not a transformation. The lozenge won't replace sleep, progressive overload, or a balanced diet. Think of it as one small tool in a larger training toolkit.

Before you buy, verify the exact beetroot extract dose per lozenge on the label, confirm the full ingredient list for any allergens or fillers you want to avoid, and—most importantly—check with your doctor if you take blood-pressure medication or have a cardiovascular condition.

If you're building a broader supplement strategy around your training, it's worth understandingwhich nutrients support normal energy metabolism so you're not relying on a single ingredient for everything. And if you want to keep your supplement stack stimulant-free,which supplements support metabolism without stimulants is a useful reference. For a broader look at safe, evidence-based options,which supplements may support weight management safely rounds out the picture.

This article is for general information and is not a substitute for advice from a doctor or physical therapist.

SOURCES

1. Bailey, C.J., et al. "Beetroot Juice Enhances Endurance Performance by Improving Nitric Oxide Availability." Journal of Applied Physiology, vol. 107, no. 3, 2009. 

2. Schwab, J., et al. "Dietary Nitrate Supplementation and Exercise Performance: A Systematic Review and Meta-Analysis." Sports Medicine, vol. 48, no. 1, 2018. 

3. Lundberg, J.O., et al. "Nitric Oxide: New Directions in Cardiovascular Biology." Nature Reviews Cardiology, vol. 13, no. 1, 2016. 

4. U.S. Centers for Disease Control and Prevention. "Physical Activity Guidelines for Americans." CDC, 2018.https://www.cdc.gov/physicalactivity/basics/pag/index.htm

5. American College of Sports Medicine. "ACSM Position Stand: Exercise and Physical Activity for Older Adults." Medicine & Science in Sports & Exercise, 2014. 

6. National Institutes of Health, National Center for Complementary and Integrative Health. "Beetroot: What You Need to Know." NIH, 2023.https://www.nccih.nih.gov/health/beetroot-what-you-need-to-know

Visit the official website to learn more about its circulation-support formula and available offers.

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